Permutation-padlock.



W. D. WATKINS.

PERMUTATION PADLOOK.

APPLIOATION FILED my 4, 1912.

11,048,772, Patented Dec. 31, 1912.

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WILLIAM DELBERT WATKINS, OF HONEY BEND, ILLINOIS.

PERMUTATION-PADLOCK.

Specification of Letters Patent.

Patented Dec. 31, 1912.

Application filed May 4, 1912. Serial No. 695,261.

To all whom it may concern Be it known that I, WILLIAM Dnnnnn'r WATKINS, a citizen of the United States, residing at Honey Bend, in the county of The primary object of the present inven tion is to provide a pad lock of this character with a keyless locking means which can only be opened by a certain combination thereby preventing unauthorized persons from tampering with. the same.

A further object of the present invention is to novelly construct a device of this char-I acter which will be inexpensive in the cost of manufacture, strong durable and efiicient in use, and one which the various parts thereof are not liable to become broken.

Other objects will appear hereinafter as the description continues.

With the above and other objects in view this invention consists in the novel construction, combination, formation and arrangement of parts as will be hereinafter more fully described, claimed, and particularly pointed out in the appended drawings in which,

Figure 1 is a side elevation of a pad lock e'mbodymg my inventlon; Fig. 2 1s a similar view having the front plate thereof removed therefrom; Fig. 3 is a section taken on the line 3-3 of Fig. 2; Fig. 4 is a section takenon the line 4E 1 of Fig. 2; Fig. 5 is a detail perspective View of one of the locking pawls, and Fig. 6 is a longitudinally extending sectional view taken on the line 66 of Fig. 2.

Referring now to the drawings wherein I have shown a specific embodiment of the present invention, the numeral 10 indicates a housing or casing of the ordinary padlock which consists of a rear wall 11, side walls 11' and a front wall 12 the latter of which being detachably secured to the side walls by screws or any other suitable means. Pivotally mounted as at 13 in one end of the housing is a shackle 14, a leaf spring 15 rests against the said shackle for normally holding the same in an open position when the opposite end of the shackle is released from the locking means. This end of the shackle being inserted in an opening formed in the housing in the usual well known manner.

Extending parallel within the lower portion of the casing is a pair of pins 16 each having loosely mounted thereon a pawl 17 said pawls being oppositely disposed and each provided at its outer extremity with an enlarged head portion 18 which is adapted to engage with notches formed in one extremity of the shackle 14; The heads of these pawls are considerably wider than the width of the body thereof. Loosely mounted upon the pins 16 are arms 19 which extend parallel and adjacent to said pawls and the ends thereof terminating below the heads of the said pawls. Rotatably mounted within the housing as at 20 are a pair of parallel extending shafts 21 each having a cam disk 22 mounted thereon and a smaller disk 23. The outer extremity of each of these shafts extends beyond the outer wall of the casing and are each provided with a threaded portion to receive a milled knob 24 whereby the same may be easily rotated. Formed on each of these shafts adjacent the threaded portion thereof is a hexagonal portion 25 on which is mounted a circular plate 26, the latter having graduations marked on the outer face thereof to register with graduations 27 formed upon the outer plate 12 of the housing.

The rear wall 11 of the casing has secured thereto, as at 29, a pair of leaf springs 28. The opposite or free ends of these leaf springs are adapted to rest against the pawls and the said arms for normally holding the same in an inward position, thereby causing the heads of the pawls to normally engage the shackle when the same is in a closed position. These leaf springs 28 are each provided with a depending portion which partly encircles the smaller disk 23 formed upon each of the shafts 21, thereby forming a frictional engagement with the same which will prevent the shafts from rotating too freely. The free ends of these leaf springs extend upwardly and rest against the outer faces of the pawls 17 and their extremities are provided with angular portions 28 which are adapted to rest upon the outer faces of the arms adjacent the upper extremities thereof. It is apparent from the foregoing description that these leaf springs normally hold the arms and locking pawls in an inward position and as one of the cam disks 22 lies closely adjacent each of the arms, the said pawls will be prevented from being spread apart until the flattened portion formed upon said cam disk lies parallel with the arms, as will be hereinafi er more fully described. J ournaled within the housing between the said pawls and arms is an elliptical-shaped cam wheel 30 which when in a substantially vertical position will allow the springs to normally hold the pawls into engagement with the said shackle; but when the same is rotated the longerv arms thereof will spread the said pawls and: arms apart thereby allowing the shacklev Extend-j ing from the cam 30 and beyond the face of the housing is a pin having keyed thereto a milled knob 32 whereby the cam wheel, Itsis further ap-l parent from the above description that the cam wheel 30 cannot spread the locking; pawls apart without also spreading arms.

to be removed from the housing.

may be operated at will.

19 and to provide means whereby these arms may be released at certain desired intervals: the outer periphery of each of the cam disks; 22 is provided with a flattened portion 33; which when lying parallel with said arms the same may be spread apart through the stantlally as described.

instrumentality of the cam wheel.

It is obvious from this construction thatj in operating the cam disks so as the flatj tened portions thereof lie parallel with the: arms 19 a certain predetermined numberindicated on the graduations formed on the circular plate 26 will be in alinement with the flattened portion 33 formed on each cam disk and when the shafts 21 have been rotated through the instrumentality of the; milled knobs 24 the predetermined number: formed on the graduations will register with a number formed upon the indicating linesor marks 27 on the outer wall of the housing; It will be further seen that by this construction that the operator may easily change the combination of this look by first removthe cam disks lie parallel with the arms to permit the shackle to be opened, as before;

described.

Whereas I have shown a specific embodiment of the present invention it is to be un-i derstoocl that other minor details of construction may be resorted to that come within the scope of the appended claims without departing from the spirit of the present invention.

What I claim is 1. A padlock consisting of a housing, a shackle pivot-ally secured thereto, spring pressed pawls mounted in said housing and adapted to engage said shackle, arms pivotally mounted in said housing and lying parallel with said pawls, a cam wheel mounted in said housing and interposed between said arms and said pawls, cam disks mounted in said housing and lying adjacent said arms and means for rotating said cam wheel iubistantially as and for the purpose speci- 2. In a device of the character described, the combination of a housing having a shackle pivotally secured thereto, spring pressed pawls mounted in said housing and adapted to engage said shackle, arms pivotally mounted in said housing and lying parallel with said pawls, a pair of parallel extending shafts mounted in said housing, cam disks mounted on said shafts, a portion of the periphery of each of said disks being flattened, said shafts extending beyond the casing, means secured to the ends of said shafts for rotating the same, means interposed between said arms and said pawls, means fo-rrotating the last mentioned means whereby the shackle may be released from the pawls when the flattened portions of the cam disks lie parallel with the arms, sub- 3. A pad lock comprising a casing, a shackle pivotally secured thereto, a pair of parallel extending pawls mounted in said casing, said pawls having enlarged heads adapted to engage said shackle, arms pivotally mounted in said casing and lying adjacent said pawls, a pair of parallel extending shafts mounted in said casing, disks mounted on said shafts, leaf springs mounted in said casing, the lower extremities thereof partly encircling said shafts, the opposite extremities thereof adapted to rest upon the said pawls and arms, means for rotating said disks, the said disks being adapted to limit the outward movement of said arms, a flattened portion formed upon each of said disks whereby the said arms may be released, and a cam wheel interposed between said arms and said pawls whereby rotating said cam wheel, the said shackle will be released when the flattened portion of the cam disk lie parallel with the said arms, substantially as and for the purpose specified.

4. In a padlock, the combination with a housing having a shackle pivotally secured thereto, of spring pressed pawls mounted in said housing means for normally holding the pawls in looking engagement with one end 01 said shackle, a pair of arms pivotally substantially as and for the purpose speci- 10 mounted in said housing adjacent said pawls, fied.

a cam wheel interposed between said arms In testimony whereof I hereunto afiix my and C{said pawls mfeansdfor limiting thehoutsignature in the presence of two Witnesses.

war movement 0 sai arms means W ereby the last mentioned means may be released, WVILLIAM DELBERT WATKINS and means for operating said cam wheel Witnesses:

whereby the pawls will be released from said P. A. SELLERS,

shackle when said arms have been released, R. J. POTTS.

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents. Washington, D. G. 

